Type
The type held by the Selective
.
Type
Functions
val select : ('a, 'b) Stdlib.Either.t t -> ('a -> 'b) t -> 'b t
select e f
apply f
if e
is Left
. It allow to skip effect using Right
.
val branch : ('a, 'b) Stdlib.Either.t t -> ('a -> 'c) t -> ('b -> 'c) t -> 'c t
branch
is like select
. It chooses between two effects.
include Indexed_apply.WITH_APPLY with type ('a, 'index) t := 'a t
val apply : ('a -> 'b) t -> 'a t -> 'b t
May apply a function wrapped into an t
to a value also wrapped into an t
.
include Indexed_apply.WITH_LIFT2 with type ('a, 'index) t := 'a t
val lift2 : ('a -> 'b -> 'c) -> 'a t -> 'b t -> 'c t
Lift a binary function that acts on arbitrary values into a function that acts t
values.
val lift : ('a -> 'b) -> 'a t -> 'b t
Mapping over t
from 'a
to 'b
.
val lift3 : ('a -> 'b -> 'c -> 'd) -> 'a t -> 'b t -> 'c t -> 'd t
Lift a ternary function that acts on arbitrary values into a function that acts t
values.
val replace : 'a -> 'b t -> 'a t
Create a new t
, replacing all values of the given functor by given a value of 'a
.
val void : 'a t -> unit t
Create a new t
, replacing all values in the given functor by unit
.
val if_ : bool t -> 'a t -> 'a t -> 'a t
Same of branch
but using a Boolean
as disjunction.
val bind_bool : bool t -> (bool -> 'a t) -> 'a t
Monad
bind
specialized for Boolean.
val when_ : bool t -> unit t -> unit t
Conditionally perform an effect.
val exists : ('a -> bool t) -> 'a list -> bool t
Selective version of List.exists
.
val for_all : ('a -> bool t) -> 'a list -> bool t
Selective version of List.for_all
.
val or_ : bool t -> bool t -> bool t
val and_ : bool t -> bool t -> bool t
val while_ : bool t -> unit t
Keep checking an effectful condition while it holds.
Infix operators
val (<*>) : ('a -> 'b) t -> 'a t -> 'b t
Applicative
functor of ('a -> 'b) t
over ('a, 'index) t
to ('b, 'index) t
.
val (<**>) : 'a t -> ('a -> 'b) t -> 'b t
Flipped Applicative
functor of ('a -> 'b) t
over ('a, 'index) t
to ('b, 'index) t
.
val (*>) : unit t -> 'a t -> 'a t
Discard the value of the first argument.
val (<*) : 'a t -> unit t -> 'a t
Discard the value of the second argument.
val (<$>) : ('a -> 'b) -> 'a t -> 'b t
Infix version of CORE.map
.
val (<&>) : 'a t -> ('a -> 'b) -> 'b t
Flipped and infix version of CORE.map
.
val (<$) : 'a -> 'b t -> 'a t
val ($>) : 'a t -> 'b -> 'b t
Flipped and infix version of OPERATION.replace
.
val (<*?) : ('a, 'b) Stdlib.Either.t t -> ('a -> 'b) t -> 'b t
val (<||>) : bool t -> bool t -> bool t
Infix version of CORE
.or_.
val (<&&>) : bool t -> bool t -> bool t
Infix version of CORE
.and_.
Syntax
include Indexed_apply.SYNTAX with type ('a, 'index) t := 'a t
val let+ : 'a t -> ('a -> 'b) -> 'b t
let
operator for mapping.
val and+ : 'a t -> 'b t -> ('a * 'b) t
and
operator for the monoidal product.